Legal claims defining the scope of protection, as filed with the USPTO.
2. The LED-filament of claim 1, wherein the photoluminescence material layer comprises a single—layer structure comprising a single layer containing the broadband green to red photoluminescence material and the narrowband red photoluminescence material.
3. The LED-filament of claim 2, wherein the single layer is in the form of a continuous strip that covers all of the LED chips and the region of the front face of the substrate between the LED chips.
5. The LED-filament of claim 4, wherein the first layer is in the form of a continuous strip that covers all of the LED chips and the region of the front face of the substrate between the LED chips.
6. The LED-filament of claim 1, wherein the light scattering material is white in color.
7. The LED-filament of claim 1, wherein, in an off-state, the LED-filament appears white in color.
8. The LED-filament of claim 1, wherein the light scattering material is selected from the group consisting of: zinc oxide (ZnO), titanium dioxide (TiO2), barium sulfate (BaSO4), magnesium oxide (MgO), silicon dioxide (SiO2), aluminum oxide (A12O3), zirconium dioxide (ZrO2) and mixtures thereof.
9. The LED-filament of claim 1, wherein the light scattering layer comprises a mixture of the particles of the light scattering material and a light transmissive binder, and wherein a weight loading of the light scattering material to the light transmissive binder is from 0.2 wt % to 5 wt %.
10. The LED-filament of claim 1, wherein the LED-filament has a luminous efficacy of at least 180 lm/W.
11. The LED-filament of claim 1, wherein the narrowband red photoluminescence material is one of: K2SiF6:Mn4+, and K2TiF6:Mn4+.
12. The LED-filament of claim 1, wherein the light scattering layer comprises a respective light scattering layer on the front and back faces of the substrate and wherein a thickness or weight loading of the particles of the light scattering material in the respective light scattering layers are different.
14. The LED-filament lamp of claim 13, wherein the photoluminescence material layer comprises a single—layer structure comprising a single layer containing the broadband green to red photoluminescence material and the narrowband red photoluminescence material.
16. The LED-filament lamp of claim 13, wherein the light scattering material is white in color.
17. The LED-filament lamp of claim 13, wherein the light scattering material is selected from the group consisting of: zinc oxide (ZnO), titanium dioxide (TiO2), barium sulfate (BaSO4), magnesium oxide (MgO), silicon dioxide (SiO2), aluminum oxide (Al2O3), zirconium dioxide (ZrO2) and mixtures thereof.
18. The LED-filament lamp of claim 13, wherein the light scattering layer comprises a mixture of the particles of the light scattering material and a light transmissive binder, and wherein a weight loading of the light scattering material to the light transmissive binder is from 0.2 wt % to 5 wt %.
19. The LED-filament lamp of claim 13, wherein the narrowband red photoluminescence material is one of: K2SiF6:Mn4+, K2GeF6:Mn4+, and K2TiF6:Mn4+.
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October 10, 2023
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